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Hydraulic and geochemical interactions between surface water and sediment pore water in seasonal hypersaline Maharlu Lake, Iran
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-06-16 , DOI: 10.1002/hyp.13797 Roghayeh Khosravi 1 , Mehdi Zarei 1 , Ondra Sracek 2
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-06-16 , DOI: 10.1002/hyp.13797 Roghayeh Khosravi 1 , Mehdi Zarei 1 , Ondra Sracek 2
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Study of interactions between surface‐water and pore‐water in lakes is complicated due to spatio‐temporal heterogeneities in flow condition across the sediment–water interface. In this study, seasonal hypersaline Maharlu Lake was investigated by collecting surface‐water and pore‐water samples from four nests of multilevel piezometers installed at different distances from the inflow of rivers to the lake. The hydraulic heads in the piezometers as well as vertical profiles of Mg+2, Na/Cl, and Br/Cl were used to investigate both hydraulic and geochemical interactions between surface‐water and pore‐water in the lake. Depletion of lake surface water and pore water with respect to B, Br, Li+, K+, Mg2+ and the absence of Mg‐K chlorides and sulphates in the lake bed sediments is probably due to leakage of highly evaporated residual brine from the lake. Hydraulic gradients in the multilevel piezometric nests indicate that a general downward flow from surface‐water to pore‐water occurs across sediment–water interface. Vertical profiles of Br/Cl, Mg2+, and Na/Cl showed that the maximum flow rate was more than 1 m/yr close to the mouth of the inflowing rivers. The downward vertical flow was limited in the area far from the inflowing rivers due to the presence of an impermeable confining halite layer which interrupts the hydraulic connection between shallow pore water (less than 50 cm deep) and deeper zones. The hydraulic and geochemical interactions between surface‐water and pore‐water across sediment–water interface in the Maharlu Lake are of interest to find out the fate of pollutants and their distribution in the lake.
中文翻译：
伊朗季节性高盐Maharlu湖地表水与沉积物孔隙水之间的水力和地球化学相互作用
由于跨沉积物-水界面的流动条件时空非均质性，对湖泊地表水与孔隙水之间相互作用的研究非常复杂。在这项研究中，通过从安装在距河流入湖距离不同的距离处的四个多级压力计巢中收集地表水和孔隙水样本，对季节性高盐度马哈鲁湖进行了调查。测压仪中的水力头以及Mg + 2，Na / Cl和Br / Cl的垂直剖面用于研究湖泊中地表水与孔隙水之间的水力和地球化学相互作用。B，Br，Li +，K +，Mg 2+对湖泊地表水和孔隙水的消耗湖床沉积物中缺乏Mg-K氯化物和硫酸盐可能是由于湖中大量蒸发的残留盐水泄漏造成的。多级测压巢中的水力梯度表明，从地表水到孔隙水的总体向下流动发生在沉积物-水界面之间。Br / Cl，Mg 2+的垂直剖面，Na / Cl表示流入河口附近的最大流量大于1 m / yr。由于存在不可渗透的封闭盐岩层，该垂直向下的流动被限制在远离流入河流的区域，该层限制了浅孔水（深度小于50 cm）与深层区域之间的水力联系。研究马哈鲁湖中沉积物-水界面之间的地表水与孔隙水之间的水力和地球化学相互作用，对于了解污染物在湖中的命运及其分布具有重要意义。
更新日期：2020-06-16
中文翻译：
伊朗季节性高盐Maharlu湖地表水与沉积物孔隙水之间的水力和地球化学相互作用
由于跨沉积物-水界面的流动条件时空非均质性，对湖泊地表水与孔隙水之间相互作用的研究非常复杂。在这项研究中，通过从安装在距河流入湖距离不同的距离处的四个多级压力计巢中收集地表水和孔隙水样本，对季节性高盐度马哈鲁湖进行了调查。测压仪中的水力头以及Mg + 2，Na / Cl和Br / Cl的垂直剖面用于研究湖泊中地表水与孔隙水之间的水力和地球化学相互作用。B，Br，Li +，K +，Mg 2+对湖泊地表水和孔隙水的消耗湖床沉积物中缺乏Mg-K氯化物和硫酸盐可能是由于湖中大量蒸发的残留盐水泄漏造成的。多级测压巢中的水力梯度表明，从地表水到孔隙水的总体向下流动发生在沉积物-水界面之间。Br / Cl，Mg 2+的垂直剖面，Na / Cl表示流入河口附近的最大流量大于1 m / yr。由于存在不可渗透的封闭盐岩层，该垂直向下的流动被限制在远离流入河流的区域，该层限制了浅孔水（深度小于50 cm）与深层区域之间的水力联系。研究马哈鲁湖中沉积物-水界面之间的地表水与孔隙水之间的水力和地球化学相互作用，对于了解污染物在湖中的命运及其分布具有重要意义。
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